Gates and orifices were significant common structures used in controlling and adjusting the flow in water system channels. Installing of an orifice with sluice gates, increase the flow discharge with minimizing the horizontal jets under gate that was attributed with higher bed flow velocity and larger scour geometry downstream these gates. An experimental study was conducted to examine the flow pattern and the bed configurations downstream sluice gates with an orifice. In this research, a circular orifice employed with sluice gates as a means of energy dissipation downstream the gates, was explored. Forty-five runs were completed under 3 discharges, 3 upstream water heads, and 7 tail gate water depths. Five models for sluice gate with orifice were utilized. A series of regime plots were created to help designing the sluice gate with orifice as heading up and flow distributions structures. The outcomes illustrated that combining of an orifice with sluice gates productively scattered the jump energy and diminished the downstream local scour compared to the conventional sluice gate. Additionally, existed equations used to predict the jump length downstream sluice gate were applicable in case of sluice gate with orifice provided similar flow conditions were achieved. The optimum ratio of orifice and under gate areas was also introduced.

闸门和孔口是用于控制和调节水系统通道流量的重要常用结构。安装带有闸门的节流孔，可最大程度地减少闸门下方的水平射流，从而增加流量排放，这归因于这些闸门下游较高的床流速和较大的冲刷几何形状。进行了一项实验研究，以检查带有孔口的闸门下游的流动模式和床的配置。在这项研究中，探索了与闸门一起使用的圆形孔口，作为闸门下游的能量消散手段。在3个排放口，3个上游水头和7个尾门水深下完成了45次运行。使用带孔的水闸的五个模型。创建了一系列状态图，以帮助设计带孔的水闸闸门，作为水流向上和流量分布的结构。结果表明，与传统的闸门相比，孔板与闸门的结合有效地分散了跳跃能量，并减少了下游的局部冲刷。此外，在具有相似流量条件的闸门带有节流孔的情况下，可使用现有的方程式来预测下游闸门的跳跃长度。还介绍了孔口和门下面积的最佳比例。现有的方程式可用于预测下游闸门的跳动长度，只要闸门具有孔口且条件相似，即可适用。还介绍了孔口和门下面积的最佳比例。现有的方程式可用于预测下游闸门的跳动长度，如果闸门具有孔口，且流量条件相似，则适用。还介绍了孔口和门下面积的最佳比例。